Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca688c0a61967abf…

MALICIOUS

PDF

74.9 KB Created: 2021-02-22 22:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 00ce23cad56bd440930f2fb1236c161f SHA-1: 9ceeb83312b33fa08ae6e561b0e212fa2bbd5139 SHA-256: ca688c0a61967abf5832c9981ffda3fa80b0bab019bf2a64018adf4e086ee57d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/strik?utm_term=guess+fast+food+game PDF link annotation
    • https://cdn.sqhk.co/tovipovo/CAo0ogg/home_renovation_tv_shows_uk_2020_channel_4.pdfIn PDF document text
    • https://tuzakalo.weebly.com/uploads/1/3/4/4/134492431/lenuvur_xofivebexug.pdfIn PDF document text
    • https://xagewomovow.weebly.com/uploads/1/3/4/0/134040632/9708532.pdfIn PDF document text
    • http://shoop-fm.ru/flyff_billposter_skill_guidetb7vn.pdfIn PDF document text
    • http://dresdenpharma.ru/anritsu_checkweigher_manualk5oqs.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/Tz1iaih/91138904864.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/hfuiijd/kasituzaketo.pdfIn PDF document text
    • http://stepka2016.xyz/pojukunugewotugafufidjy29.pdfIn PDF document text
    • https://lalusaguru.weebly.com/uploads/1/3/4/6/134611329/zememonuxusix_tibumek.pdfIn PDF document text
    • https://verefatodefi.weebly.com/uploads/1/3/4/7/134722939/nogekiw-wilomuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/NVibshh/21685818984.pdfIn PDF document text
    • https://regurawuxafedan.weebly.com/uploads/1/3/0/7/130740517/373d778cfb2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sixolose/28703208766.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/mla_bibliography_format_journal_article.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/kazojobugikujubutusujot.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 5132 bytes
SHA-256: ae8786c847f93ece8969cd707bfaef1b719cd131f36e4516eaf26c376655cb0b
font_01_sfnt_off0000f9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F2 10784 bytes
SHA-256: 2453ea0c497f0071c759783a93fcc026c6a2cbf0544d613a07ccde1a5d593208

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